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Special Shapes & Sizes
The range of Ormonde Special Shaped Bricks
includes special bricks manufactured in accordance with BS
4729, I.S. 91 and purpose made specials. The dimensions of
special shaped bricks are chosen to co-ordinate with standard
brick sizes (215 x 102.5 x 65 mm).
The Standard Special Shapes included below
are named by type and coded in accordance with BS 4729 e.g.
AN representing angle and cant bricks.
Special Shaped Brick Specifications
Forms of Bricks
Although the diagrams in this website indicate
solid bricks, bricks of special shapes may be frogged or perforated.
All standard bricks are perforated.
Faced Surfaces
The surfaces of the bricks which will be faced
are indicated by shading in the diagrams shown. Surfaces not
visible in the diagrams are not faced. Specials shown in situ
are fully shaded for identification purposes.
Colour and Surface Texture
With some types of bricks and manufacturing
techniques, it is not possible to ensure that the colour and
texture of all the exposed faces of bricks of special shapes
exactly match those of the corresponding standard bricks.
Left and Right Handed Bricks
Left - or right - handed versions will sometimes
need to be specified, e.g.
(a) where the special shape is asymmetric.
(b) where the directional nature of the surface
texture of the bricks requires them to be laid in one aspect
to avoid variations in appearance in the built wall.
Compressive Strength
Clay bricks of special shapes & sizes may
have a lower compressive strength than standard bricks made
from the same raw materials.
Durability
Bricks of special shapes which are to be used
in positions where they are liable to be saturated and frozen
e.g. in parapets, copings, cappings and sills, need to be
frost resistant in accordance with durability category F as
specified in BS 3921 or F2 in accordance with EN771-1.
We recommend that design and workmanship be
in accordance with I.S.325: Part 2 – ‘Masonry
Construction’ or BS 5628 – 3 ‘Code of Practice
for Use of Masonry’.
Recommended References
I.S. 91 - Irish Standard for Clay Building
Bricks.
BS 3921 - British Standard Specification for Clay Bricks.
EN771-1 - European Standard Specification for Masonry Units
– Part 1 : Clay masonry units
BS 4729 - British Standard Specification of Dimensions of
bricks for special shapes & sizes.
I.S. 325 : Part 2 - Irish Standard Code of Practice for Use
of Masonry
BS 5628 : Part 3 - British Standard Code of Practice for Use
of Masonry.
BDA Design Note 13 - The Use of Bricks of Special Shape.
Notes
- Special Bricks may be frogged or perforated.
- Shading denotes faces finished on single brick specials
illustrated.
- All dimensions in mm.
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